this is horrible. I have been spending and spending on the wrong things! I think ah, average out, I can spend up to 40 bucks per 50-minute lesson’s materials.

My coming lesson observation’s materials, I think i spent $13 x 4 boxes of electro chemistry set, $20 on 1 box of volcano set… and then i bought litmus papers (so no need go through hassle of requisitions from the lab next time) and universal indicator papers - 3 x $11 each.. omg, that is about $110 already. Not counting those miscellaneous things like vinegar, bicarbonate of soda, lemons.. trays .. etc… my bonus will be gone just likdat.. even though most materials can be recycled..

sad.. how to save cost to make a very wonderful lesson? I think my next few observations have to minimize on cost liao.. must be cost-effective..